Free tools for generating 3D models from photos usually include open-source photogrammetry software like Meshroom, free tiers of mobile apps such as Polycam, and limited free versions of tools like 3DF Zephyr Free or COLMAP.
These tools use photogrammetry—analyzing multiple photos of an object from different angles—to build 3D models, ideal for hobbyists scanning small items, students learning 3D design, or creators testing ideas without cost.
If you’re new to photo-to-3D, start with Meshroom (desktop, open-source) for full control or Polycam’s free mobile plan (uses your phone’s camera) to easily scan simple objects like a mug or toy and practice reconstruction.